Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?

Annotations already declare readOnlyHint, idempotentHint and non-destructive, so the safety profile is covered structurally. The description adds content-level context (what the listing contains, that pagination is supported) but says nothing about ordering, page size behavior, total counts, or rate limits, so it is solidly useful without being rich.

Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.

Is the description appropriately sized, front-loaded, and free of redundancy?

Two sentences, front-loaded with the resource and what is returned, then the parameter affordances. Slightly dense jargon ('live released', 'authored-hint coverage counts') costs a little clarity but no sentence is wasted.

Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.

Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?

With no output schema, the description compensates by enumerating the returned components (registry, aliases, caveats, three coverage counts), which is exactly what an agent needs. Only pagination semantics and result ordering remain unstated.

Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.

Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?

Schema coverage is 0%, so the description carries the burden, and it does clarify that the game filter accepts 'a game name or slug' — real added meaning the schema lacks. However, limit/offset are only gestured at with 'supports pagination'; their defaults, bounds and interaction are left entirely to the schema.

Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.

Does the description clearly state what the tool does and how it differs from similar tools?

States a clear verb and resource: 'List the live released kingy.wiki registry' plus the payload contents (aliases, build caveats, coverage counts). It is distinguishable from get_guide/get_hint/search_guides by being an enumerating registry tool, though it never explicitly contrasts itself with the siblings the way a 5 would.

Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.

Does the description explain when to use this tool, when not to, or what alternatives exist?

The description only asserts capabilities ('Supports pagination and an optional game name or slug') rather than saying when to reach for list_wikis versus search_guides when hunting a specific guide or hint. No when-not conditions or routing guidance are given.

Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.